Malicious PDF — malware analysis report

Static analysis result for SHA-256 10af523b1a16a403…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 03:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d3fd13c90c266ce363b539d32745d6e SHA-1: 401150277b80aa5ed757a2da4c4617fefaedbc3b SHA-256: 10af523b1a16a403c588df9b4e4e153c8ef477f81bb085903931d32c6a914ad2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd550eb352---kalatewejimarozukugugup.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/85007104781.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/80214076408.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/gipapozovutetorezixovuwub.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091610484964.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/66184238101.pdfIn PDF document text
    • http://etre-belle.su/images/file/jobazuviwumixizupubaxer.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/gekikafadifeguxunofojikij.pdfIn PDF document text
    • https://506hlapeta.com/files/file/84021810211.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e684609ce6---babiriwumonubamutuzo.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/wuwukatosezomakexifejuros.pdfIn PDF document text
    • http://mestan.by/images/file/zosapunor.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/58153821313.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/82538860112.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210902165639.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/risul.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/nufibekemex.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136708cadc9b---kezubusezukulajofuviride.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138253158fa7---31641049711.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/8785689256.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/xomizeterelanur.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/8507394669.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/pojumixawob.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/wewixegojidubol.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/77932587085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ken+burns+effect+android+appPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 18584 bytes
SHA-256: 0d389a5230692a5cd5f505847e267e0aa7470b8101f1ed3cd01ab1f6ab6035d3
font_01_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 10796 bytes
SHA-256: eef24ac3fdb7118ab160d3e902562e7839565ae43cf35d052f81d6638c5e8aba

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